This paper introduces the sources of phase noise in high-speed coherent optical communication systems and its impact on optical transmission performance.Based on 400G capacity simulation,the performance differences under different laser linewidths and dispersion are compared.The results show that the limiting factors in high-speed coherent optical communication are mainly the phase noise of the laser and the equalization-enhanced phase noise generated by dispersion coupling in the transmission link.The digital multicarrier technology has stronger tolerance and can transmit longer distances than the single carrier technology.
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